离子束-等离子体中电磁波的受激Brillouin背散射

Stimulated Brillouin Backscattering of an Electromagnetic Wave in Ion Beam—Plasma System

本文研究离子束-等离子体系统中传播的电磁波的受激Brillouin背向散射。我们导出该系统中的参量过程的色散关系,得到不稳定性增长率公式和激发参量不稳定性所需的泵波功率阈值表达式。最后,给出增长率和阈值功率随束速度及束密度变化的数值计算。数值结果表明,束的存在对该参量激发过程有显著影响。

In this paper, the stimulated Brillouin backscattering of on electraomagnetic wave in ion beam-plasma system is investigated. A dispersiom relation of the parametric process in the system is derived. Formulae are obtained for the growth rate of the parametic instability and the threshold power of the pump wave required to excite the instability. Finally, we give numerical results of dependence of the growth rate and the threshold power on the beam velocity and the beam dencity. The numerical results show that presence of the ion beam has a substantial effect on the paramertric process.